src/patches/suse-2.6.27.25/patches.fixes/kdb-kdump.diff

   1 From: Jay Lan <jlan@sgi.com>
   2 Subject: Fix CONFIG_KDB_KDUMP on xSeries
   3 Patch-mainline: not yet
   4 References: bnc#436454
   5
   6 This patch fixes a problem that the capture kernel crashes with various
   7 backtraces after the machine has been crashed (both sysrq-trigger and panic()).
   8 Machines were that problem could reproduced at SUSE were molitor.suse.de and
   9 korner.suse.de.
  10
  11 KDB was turned off in that scenarios.
  12
  13 That patch succeeds in following scenarios:
  14
  15   a) kdb=0
  16      modprobe crasher call_panic
  17
  18   b) kdb=1/0
  19      echo c > /proc/sysrq-trigger
  20
  21   b) kdb=1
  22      ESC KDB
  23      kdb> kdump
  24
  25 But it fails in:
  26
  27   kdb=1
  28   modprobe crasher call_panic
  29
  30 That has to be investigated. But I think that's unrelated to that patch,
  31 and it's no regression.
  32
  33
  34 Signed-off-by: Jay Lan <jlan@sgi.com>
  35 Signed-off-by: Bernhard Walle <bwalle@suse.de>
  36
  37 ---
  38  arch/x86/kdb/kdba_support.c |    4 +---
  39  1 file changed, 1 insertion(+), 3 deletions(-)
  40
  41 --- a/arch/x86/kdb/kdba_support.c
  42 +++ b/arch/x86/kdb/kdba_support.c
  43 @@ -35,8 +35,6 @@ void kdba_kdump_prepare(struct pt_regs *
  44         if (regs == NULL)
  45                 regs = &r;
  46
  47 -       machine_crash_shutdown_begin();
  48 -
  49         for (i = 1; i < NR_CPUS; ++i) {
  50                 if (!cpu_online(i))
  51                         continue;
  52 @@ -44,7 +42,7 @@ void kdba_kdump_prepare(struct pt_regs *
  53                 KDB_STATE_SET_CPU(KEXEC, i);
  54         }
  55
  56 -       machine_crash_shutdown_end(regs);
  57 +       machine_crash_shutdown(regs);
  58  }
  59
  60  extern void halt_current_cpu(struct pt_regs *);